Add new API for filtering questions, refactoring the options to display
old questions and include subcategories into new
question_bank_search_condition classes. Make the new API pluggable via
local_[pluginname]_get_question_bank_search_conditions.
When you followed the link to the question bank, the checkbox for the
"Show question text in the question list" option correctly reflected the
user's preference, but what was actually shown in the question bank did
not.
The options that are remembered persistently are
* Also show questions from sub-categories
* Also show old questions
* Show question text in the question list
* Number of questions per page
None of these problems affect the default roles. They only occur when
the permissions have been edited to allow restricted subsets of the
question capabilities.
In some cases, things that the restriced subset of capabilities should
have allowed were blocked by errors. In other cases, users were allowed
to do more than they should bave been due to failures to check the
right capabilities in the right places.
For full details, see the bug report.
Two of the bugs were previously reported separately as MDL-26395 and
MDL-27232.
1. We need this so that, for example, when previewing a question from
the quiz editing page, the preview uses the filter settings, theme and
language set for that quiz and course.
